28709555 has 8 divisors (see below), whose sum is σ = 39373152. Its totient is φ = 19686528.

The previous prime is 28709519. The next prime is 28709573. The reversal of 28709555 is 55590782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28709555 - 2¹⁶ = 28644019 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410102 + ... + 410171.

It is an arithmetic number, because the mean of its divisors is an integer number (4921644).

Almost surely, 2^28709555 is an apocalyptic number.

28709555 is a deficient number, since it is larger than the sum of its proper divisors (10663597).

28709555 is an equidigital number, since it uses as much as digits as its factorization.

28709555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820285.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 28709555 is about 5358.1298043254. The cubic root of 28709555 is about 306.2025621372.

The spelling of 28709555 in words is "twenty-eight million, seven hundred nine thousand, five hundred fifty-five".